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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07eacef1539cd35d3ee9d0d7c3fc7e634b0c560d6e627dec383ecd2a7849020c' 
  AND token = '90jJVPTuYAdMRqaS64byyGGA2wqPxxYd+dKy0TI7vx4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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