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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36241eff81e4829d9645682c5b07efe072aa9ca4b5a7ef2ef8b754ca65ba27dc' 
  AND token = '+zVhMFF0AHib0Le/aDEr+O2g3oZ5owjx3I4ypKH2bBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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