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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb34e59840bec0b5bc49d3507a5a3b575bb685f028ef108e8a873c03b6480fda' 
  AND token = 'hbrUIVUAqTasF3TRtGVhZPOlLrJt9HgfgVhwq2DNTTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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