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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b452619db70a9e2edde81f5761931489f159397ae4122894396697dfa9e1bc89' 
  AND token = '1wTflU4q1AALF25SjLdG2NU3eVFoFgHJu3lBR3o8cnY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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