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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8fbb979ff69f08f507bc63164d82f3032a393e3d6c167676e1157ae49cae833' 
  AND token = 'Fjsg1ZKw6XgKECKd3PAO01sS/QCn35z0rXaBsEX84MM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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