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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6cf54b090d21598fbce1ea8eea612570fbf7b6d2ee5a1f1f7383ed4489c3ec5' 
  AND token = '1bLLsVq2PO01ylAQFrAOhjnXThclW9FUCNhvx+JjfFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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