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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6a9ded87f54484458932bea5809b85b42a9f327f234321ca678871e48c34d3d' 
  AND token = 'veGpMG8/ktYM3r5Ebx5AbsDe/KwQJOaw5AdsD7G+0sc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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