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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c66fdb5563358529b593dcfda2d0bb3655d6a81141c87ddc14c2200c3e22d98a' 
  AND token = '84b6tnwb214TaNmaSCNUM/nJ8kLcVgqWx38ZaM3TnYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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