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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a90ef5a31de931bf413a1d4624a37e0a01e8e49fb75b2a0b04bc92d5085bbf64' 
  AND token = 'Rwk3ajmleFoOYWzTVyuSVEUqt8dk0KPs7V3666vh0eQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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