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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df926a6c8687841f2d19e077b2f39c067395ce8f51bc3ede19875fe13c715038' 
  AND token = 'Ur9mOztvEYLJOIdOOB9CD4sktUtA6NqbfhDSCOlqsBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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