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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f348ba079a4c7c3ceae81b38c1e106a65f3e4e5ee2bff99841bff8d0052a304c' 
  AND token = '1KAglnLfi7/NKL98Uu5UtSy+M9SPQlYhz4VCRKaK/i0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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