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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b23f4eb78fa931b67786cc41815ea4f96e866896f6234d3b55a4c05a4f43d36f' 
  AND token = '430k8a9tE11JioYRDnsL3YOEGpT7rs84Ueo6s0OIEdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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