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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a20f3b2eeb168aa47f67c67573345bd9fe1f0bb997ee2dba8e5ac9e93ea617bc' 
  AND token = 'melIH0YiroM0mw+lTy5xH7M2T2MX2POl/4V6oakoQz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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