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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94724abe22657180ba4ffae956ca83f1d2965861680679ecc2bec67628b23f43' 
  AND token = '5yBY5OozhPMlS1DfqqdR0yZ7Cb2h2iqgTSGSDMi8Scs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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