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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ee4ec4e6625a7da9d3f7231386ec8c5e9fccd3d127c993c9f5b3c187972a51d' 
  AND token = 'c8SN8bn2QH2OjwtqcPesLbIw0NqJpUlgg7iSsc9OgoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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