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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4e63ac5eab8a8ca30059e450615f4df980652abb8738ef01489609a60010806' 
  AND token = 'hZ4BmubiTrGi5VV90/vi3QccBb+VRK7QiW6dUPB7RKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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