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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79c1b3e69e569a8ef82eac9c8b957a2d4ba1f77939c366ed4ff65191564e65ae' 
  AND token = 'fLeODWvvGUs47iR9MVzsJa9bcn+vNI/MacilgbOEbPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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