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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23e6682ab7d004ffa209a7b92ab70bcf6a88faf0fb8405fc97c028ca3ba9f2c5' 
  AND token = 'v5cP/l0FQTy1wrRNdeqk1Xr/s07A3aawHhP/Ir3f0Tw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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