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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02529312f0a6a04fc4a289cb825b507f30f9d60a87e125ae8a9d6f81c77a39d9' 
  AND token = '+PD4EHCrTqNPzFpzgfDb759jKHyHMT5oh3O+qfkv1ro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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