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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9848703fb19ec8a699d49fbd52fb1a6216f91a05782a4130e6005a696aebbe1' 
  AND token = 'lYvALj6R09Ow8Vh6voVDdknCKqnsvM42jfBAs3tVKH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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