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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02a8e7f1c90f01d2d54586ab237d09d8942b182588f1a85d4ee05cae1faeecae' 
  AND token = 'Lw/og90LvXyuz6cAMDKgQsL+BXTE25unUgYxabuQ4AE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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