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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e92ea68c15fffe2752d4f511ff8e8cf27ff7f2805e114d2161a6d465e549ac1' 
  AND token = '6Z5YQ2RNa5UEdeA6KFaCsp9J+X+qaEOA1Bz2Ie51YDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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