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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd7de4bd8a0bd0f3a18e615fe4161141e7dfb21cba94931dfe4135f898b53ae4' 
  AND token = '90DcfdY8pCR/mhGkcHtxIpPCEN/DWQCjt8S6sAU4XRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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