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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0418c32ceef186c54c5bae73cf2c52607a461f011fcad2813e2cac07d83a353' 
  AND token = 'ub14R8895wex3cE1ob2NQtrKzqub9baTdA/MdKScFAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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