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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23b4a40c0d3774c51dc61b4f8b2c1d25e37fbd79f40c25237b498a3d2ecadab6' 
  AND token = 'G8Td0qGWyRg9Pk2nYce9SgO6n67CSFFus6MettNADho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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