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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3086d23981762671795cbbdb43df109dd1f6070379d33e562fd62a60359666b9' 
  AND token = 'lMcVM69KPZcnkaKALTq7odIHIg2vOnuyNcfEhbgnNUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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