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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '515ca1eca5ef6f8146cd0c68a0a10c41877f98fb5be14d65a11c09166e5454c8' 
  AND token = 'ppmx+eBKpYe7QooXPz5Yb0Mf4QKTROV8HrhKGsAt318=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

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