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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5deedd28e4246ec51f8bf6a156782a7c2556f1015e4bacab3d59ebc494358f85' 
  AND token = 'rlH7PrZP0A1ToVvviKGeX1d7m9nUO5dhLmMgH9rwYZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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