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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7eced5bab2c1d3ea7dd703700cea0e8dca74a52125abfd8d5b69feba2a6b5674' 
  AND token = '+MsyD91NsiJfsrHiMmNedM3WFKG+PcJ7AOPllw0ZQ9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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