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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b6ba868816960df80292191056549bf10d8c6ee0f8997ca5580c2d7a8def887' 
  AND token = '/3luapgzvugkvV6q627nftCPP0v/Za2mr3fiCrycW1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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