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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b6db430d42ba026ed656da3bd617ffddf406cc9d58bfa60f7d3ca430abd9065' 
  AND token = 'bJ+vKIlaWq4tJCSmnnCZiZq7jl+eZXwJJDzvdagxY7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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