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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f82a4c7cd66ead106b117283f40bf6a4c8f833320dd9e5ad24f8a952bdd1612f' 
  AND token = '/s8i44w8t5C2+btSJHED8hOHk21v2z23XoCyLU/xUvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}