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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91b5e51c370e4c6b42b97d4b764d731de854865f6575a6f4a05a1e846c16251c' 
  AND token = 'CvsRHwvHp3tTeqsv2X5SUOMGHr5p6nMo8qjzWUFIrp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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