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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4c61c3cf8cea51d859d8f096b9eafab0065d6ce5ba09076010217df060989a1' 
  AND token = 'iwnqqS9NH2eHQwu+BKUI4+NO54JxAGHDeqlXYe+CJVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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