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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '180ff153c0f1e0fe77a18fd6ce0136a706a239e8362d199372e9aaee5fb464e9' 
  AND token = 'rKUT+QldFbn+B9SED2W1nURr+c5uZkhReFFIf1tc3jE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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