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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd944bdac455846b8ce713165921f9f06a77cf68c9e51a1cae5e8c34a2e23ba73' 
  AND token = '4mrMgViCllSmMa2615ufQSAaGALfiAh45hUK3q2W5Fk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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