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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e1905b5ea1d23db0a2cbaae34fbbde09ff414461bc10bc7619faa0cd794b3d1' 
  AND token = 'CaCLKPCkJx363Fleg3Rle2wdMhrygeQUmKCkULC8RA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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