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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d7eb837e3a5978d1fa667bf2f72f1ec331dfb8b7ff361030b8bde76a9110bf8' 
  AND token = '5/dQIXpdhxf/Q9oL2ltr0ufDAGrg40ojbPo3Lsq2yhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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