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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7c2a478df4dacf25d626cb52bc9c81d9046cae0e4664d2a456079127f60fb71' 
  AND token = 'IwHr+zuDVNXK1nugr1CoKVvHrHm/JR5JdM+nmhMmQ6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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