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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad7c3a88e80e6bcaae4c46be28b7ad02453b5f3fe312fbe8c4cc42a47f232667' 
  AND token = 'WaBuZTKM1R4rlOLojyt5pXrhw0sH3GCGv6PUnSxCeB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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