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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5e036ff90fe7dab43d0f8a0d5980d425cfb5debd665379f7c395217418a417b' 
  AND token = '0wrG4Xf5KgwZ5VRViA+/0c0vdPoQ43efTKC5k4YSTV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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