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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d91403ecb045bc269f80ade8de150618058168705c04c8a6584f1023ebf88c6' 
  AND token = '8MEu+aya2N7948HfjS1l3GWf0GpXn4Ckdkz5dYEsfh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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