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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efc4feb8806e1ad3a87c240e3287b6921fc36d433687e2a4890221791f6a5db0' 
  AND token = 'DYKzT5i/ohHPV64uoc6N5ai753XlThD2bMXo6IGDwzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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