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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f618b0e365c5dd73e35ea7196962631d75e613d1893f3e3e84d824e4da825cb5' 
  AND token = 'cYq+svvOhZ5JEWOQIQ52aLfmN/aaoOchbvGUXX6itIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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