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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84b2932fbb69a95e6d4ba0e3ac90424cf8a4af99ee24829577f6deed9cc19d47' 
  AND token = 'm8csfHXqWfG6nZl3H/BxQVnkeyh20q6K/u7ye8iBpqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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