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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7060732278d437bdf7225799c2e45f0066c44bc0e69a89d5fff02bb0f8551d7b' 
  AND token = '7x8nez2LsjXfVIL534de74ISIs61wNXQWpcaUJJS3Gg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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