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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05502a41eeb943c47869256ae375ec325c7d78501f32064458f6819c25f80634' 
  AND token = 'm7GjsvNiUkVqi8gVaptWdUQjOlO1YcEfDLGdU18Gqqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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