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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd941542debff49337b330f134a242b111ef655629b0530ea29b674a95294464c' 
  AND token = 'aLvr7SHN0O9TknuMev5aqs5wSbgFLFz+r1YqQqRf64M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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