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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62fa2258f46a5f56ef2ef0b0e0e04aa57f1ebf66f39ee1a1c22ece98c6183b78' 
  AND token = 'jJzmpCK4+NroeIMsTWE2Ckv2JIRitYqwIku8oc94VVs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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