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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2eb6cfd0e197a6086495ca80e9fe9227bd9e9ac72df18fe5b0e9bda4fc8f202' 
  AND token = 'olchVMovjl4RlPmtImHzSvjwLAhU2TQb3lhRs86R1Po=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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