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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03632dca0ec27286e567c18670e41427f33adf6f200498885b70d48489ddaf7f' 
  AND token = 'ZPDMuv7tmDltcETQv4Q8/xBkQlUrjNf3RYv/8aq9zS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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