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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac0ac909651d0ab9b4e754baadfb9139abecbc52cac7431b389b13e4c9adf5d9' 
  AND token = 'gdDEa+5EkMpb4r+H1JqUB6TVt2OWeOXvCveo2HO3DtI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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