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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a9ce1f3c33c094a4e06c1588ee94cc6fe2d26afc0424cb94cb63ad96aac6121' 
  AND token = '/cCzxCslxn7PPZxw88St9sO3Tj05hNOMliot5/bZfWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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