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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83e293d3138ca7b0eeaf9d197a0d9d479b1484b5b864117e4981bba25eed3700' 
  AND token = 'pN/mFnZR8z9kYV4KTrjTHRV2bP/ZQkZF7v4FbLhbA/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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