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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a320820a2362ddd47ff099d909738fedcdbfeff544e17591164305614cbda0c4' 
  AND token = '7QLkDPEBTlr2ort7jpQ7kAR5PqbzOJ42Bgz6V4ir7b0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00075

JSON explain

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