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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd584b6bfad65229ca1cbf3cc5216e6bde6b174d2d599364159b1ad635f0e0a87' 
  AND token = 'TBN6/QndSmMBa0QZW6601G37CqNSfjWiGUF2I5g0sEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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